package com.example.springboot.interceptor;

import com.auth0.jwt.exceptions.AlgorithmMismatchException;
import com.auth0.jwt.exceptions.SignatureVerificationException;
import com.auth0.jwt.exceptions.TokenExpiredException;
import com.example.springboot.utils.JWTUtil;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;

public class JWTInterceptor extends InterceptorRegistry implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Map<String, Object> map = new HashMap<>();
        String token = request.getHeader("token");
        try{
            JWTUtil.verify(token);
            return true;
        }catch (SignatureVerificationException e){
            e.printStackTrace();
            map.put("msg","无效签名！");
        } catch (TokenExpiredException e){
            e.printStackTrace();
            map.put("msg","TOKEN过期！");
        } catch (AlgorithmMismatchException e){
            e.printStackTrace();
            map.put("msg","token 算法不一致！");
        } catch (Exception e){
            e.printStackTrace();
            map.put("msg","token 无效！");
        }
        map.put("status",false);
        String json = new ObjectMapper().writeValueAsString(map);
        response.setContentType("application/json;charset=utf-8");
        response.getWriter().println(json);
        return false;
    }
}
